Data Structures & Algorithms for Intermediate Learners: Big-O, Arrays vs. Hash Maps, and Core Patterns

Sharpen your problem-solving skills by revisiting the most high-impact ideas in Data Structures & Algorithms (DSA) through an intermediate lens. In just 10 minutes, you’ll solidify how to reason about time and space complexity and make better structure choices when designing solutions. You’ll then apply these concepts to common interview- and real-world patterns—like hashing for fast lookups and linear scans with invariants—so you can quickly evaluate trade-offs and recognize which approach fits a problem. This micro-course is ideal if you already know the basics and want a focused refresher with practical decision-making frameworks.